What does the Bible say about sin in believers?

1 John 2:1 informs us that humanity's sinful nature persists even in believers. The Apostle Paul describes this internal conflict in Romans 7:15, where he acknowledges the struggle to do what is right. This duality means that while we aspire to live holy lives, the remnants of sin in us cause ongoing temptation and struggle. Believers are called to recognize their sinfulness and draw on the grace of Christ, who serves as our advocate, providing not just forgiveness but also strength to resist sin.